642694627247 has 12 divisors (see below), whose sum is σ = 679846250160. Its totient is φ = 607481500032.

The previous prime is 642694627207. The next prime is 642694627277. The reversal of 642694627247 is 742726496246.

It is not a de Polignac number, because 642694627247 - 2¹⁶ = 642694561711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642694627207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1869218 + ... + 2186175.

It is an arithmetic number, because the mean of its divisors is an integer number (56653854180).

Almost surely, 2^642694627247 is an apocalyptic number.

642694627247 is a deficient number, since it is larger than the sum of its proper divisors (37151622913).

642694627247 is a wasteful number, since it uses less digits than its factorization.

642694627247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055870 (or 4055851 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 59.

The spelling of 642694627247 in words is "six hundred forty-two billion, six hundred ninety-four million, six hundred twenty-seven thousand, two hundred forty-seven".